SEAV LRX-2186: gate opens a bit then stops

[mehsom]

Hi all,
I’ve got a 2-leaf swing gate running on a SEAV LRX-2186 controller (230V motors). Since the colder weather started I’m seeing a strange problem and I’d really appreciate some pointers before I decide whether to replace the board.
Symptom

• In the morning, when I send an OPEN command:
  • First leaf starts to open a little, then stops.
    
  • Sometimes it will try again, move a bit more, and stop again.
    
• Around 09:00 and later in the day the problem is mostly gone and the gate behaves normally.
  
• This started only recently; it used to work fine.
  

What I’ve tested so far

1. Photocell / safety bypass
   • On CN2 I bridged terminals 8–9–10 (as per manual) so the photocell/safety input is disabled.
     
   • I removed power from the photocell completely.
     
   • I also disconnected power from an RTU5024 GSM unit I had connected, so right now it’s literally just:
     • LRS-2150 controller
       
     • Motors
       
     • Mains supply
       
   • Issue STILL happens in this “bare” configuration.
     
2. Motor output voltage
   • When the gate starts moving normally I measure about 230 V AC on the motor output terminals.
     
   • When it does the “opens a bit then stops” thing and gets stuck mid-open, I measure only ~2–3 V AC on the motor output.
     
   • So it looks like the controller is cutting power to the motor completely (2–3 V looks like leakage, not real power).
     
3. Reset and learning
   • I did a full reset / re-learning procedure from the manual.
     
   • During the learn cycle the controller drives the motors through the full travel and that process completes successfully.
     
   • After learning is done, when I send a normal OPEN command, the old problem comes back: gate starts, moves a little, then stops and I see ~2–3 V at the motor output.
     
4. Photocell definitely not the cause
   • Because 8–9–10 are bridged, photocell has no power, and RTU is disconnected, I’m assuming the controller is not seeing a safety input any more.
     
   • The behaviour is exactly the same with or without the photocell connected.
     

What I suspect
Because:

• Motors can clearly move the gate during learning,
  
• Problem persists with all external stuff removed,
  
• Voltage at the motor output is cut by the board when it stops,
  

…I’m leaning towards an internal controller issue, maybe:

• Current-sense circuit or force-limit circuit thinking there is an overcurrent/obstacle and shutting the triac off,
  
• Low-voltage PSU / electrolytic capacitors sagging under load (worse when cold),
  
• Some weird parameter or EEPROM corruption where normal mode is applying a much stricter limit than the learn cycle.
  

Questions

1. Does this failure pattern sound familiar on LRX-2186 boards?
   
2. Are there known weak components on this board (e.g. PSU caps, shunt resistor, triacs) that typically cause:
   • learn OK,
     
   • normal run stops almost immediately?
     
3. From your experience, is it worth asking an electronics tech to recap / repair the board, or is it usually more economical to just fit a replacement board (LRX-2186 New / similar)?
   

i attached a picture 

Manual: https://www.manualslib.com/manual/157729...-2186.html

Thanks in advance for any help or hints!